Ratio-meter



W. J. CROWELL, JR. RATIO METER. APPLICATION FILED AUG.2I, 1918.

1,336,512, Patented Apr. 13, 1920.

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M iW V E GI e e A v) I: Aa i O A2 I h 53 F A A I A4 INVENTOR ms'e O IV4ia47qM7 d C l c d B) e 1. A 7 w ATTORNEYS To all whom, 2'25 may concern:

WILLIAM J. GROWELL, JR, or WYNGOIE, PENNsYLvANIA.

RATIO-METER.

Specification of Letters Patent. Patented Apr. 13,1920.

Application filed August 21, 1918. Serial No. 250,796.

Be it known that I, WVILLIAM J. CRownLL, Jr., a citizen of the United States, and a resident of IV ncote, county of Montgomery, State of true and exact description, reference being had to the accompanying drawings.

My present invention has for its primary object to provide a simple and effective instrument for maintaining pre-determined ratio between one variable quantity and one or more other quantities by adjusting said other quantities as required to maintain the ratio, as the first mentioned quantity varies. The invention is particularly useful for antomatically varying one fluid rate of flow so as to maintain a pre-determined ratio between that rate of flow and a second and independently variable fluid rate of flow. Flow proportioning apparatus of this character is particularly useful in furnacecontrol and water softening systems, but has various other industrial applications.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. F or a better understanding of the invention, however, and the advantages possessed by it referenceshould be had to the accompanying drawings and descriptive matter in I vation with which I have illustrated and described a preferred embodiment of my invention.

Of the drawings:

Figure l is a somewhat diagrammatic eleparts broken away and in section, I

Fig. 2 is a plan view of the shown in Fig. 1 and Fig. 3 is a diagrammatic representation apparatus of an instrument for maintaining predetermin'ed ratios between four different quantlties.

The instrument shown in Figs. 1 and 2 of.the drawings is intended to maintain a.

predetermined ratio between two quantities,

and comprises a pair of differential pressure gages A and AA, which are shown as being identical in construction and each of the pivoted U tube type. The gage A comprises a frame pivotally mounted on the knife edge pivot B. and supporting a. U tube formed of a high pressure cylinder A, a low pressure ennsylvania, have invented certain new and useful Improvements in Ratio-Meters, of whlch the following 1s acylinder A and a'tube A connecting the lower ends of the cylinders. The frame of the gage A comprises a depending arm A threaded and carrying an adjustable balance weight F. ,T he high pressure cylinder A, which, in the zero differential position of the apparatus illustrated, is at a lower level than the lower pressure cylinder A is surmounted by a charging connection A*. A

flexible pressure transmitting tube C isconnected to the upper end of the cylinder A; as shown, the connection is through the charging connection A. A flexible pressure transmitting tube 0 is connected to the upper end of the cylinder A Advantageously, as shown, the tubes 0 and C are in the form of small bore metallic tubes which cross one another at, or in close proximity to, the pivoted axis of the gage. The lower ends of the tubes 0 and C are secured to rigid piping. In so far as above described the gages A and AA are shown as identical in construction and are of the particular form of construction disclosed and claimed in my pending application Serial No. 149,970, filed Feb. 20, 1917. It is to be noted, however, that while I regard this particular form of pressure gage as a desirable one to use in the present instrument, other forms of differential pressure gages may be used in lieu thereof. The two gages should oscillate about the same axis, and, as shown, are journaled on the same pivot B.

The-lower end'of the tube G of the gage A is connected by the rigid piping (Z to a Pitot tube (l in a conduit 6. The lower end of the tube C of the gage A is connected to the rigid piping d, and, with the latter, serves to transmit the static pressure in the conduit 6 to the upper end of the cylinder A of the gage A. The upper end of the cylinder A of the gage AA' is connected to .tacts controlling the energiz'ation of the .motor G for operation one direction or the other. The pairs of contacts H and h aremounted on an arm A carried by the tilting gage AA, and extend horizontally from the arm A into the path of movement of an arm A carried by the tilting gage The arm A extends up between the two pairs of contacts H and h. the arrangement being such that if the gage AA oscillates exactly as does the gage A. neither the pair of contacts H, nor the pair of contacts h, will be closed, but when the gage AA lags behind the gage A, the arm A will force the two contacts 71. together, and when the gage AA turns ahead of the gage A, the arm A will press the two contacts H together. The closure of the contacts it causes the motor G to be energized in such I gage. As shown, this result is. accomplished by connecting a lever O. pivoted at O to the arm A of the gage A by means of the link 0. .The lever O carries a marking point 0 which sweeps across the face of the clock drivenrecord O.

As is well known to those skilled in the art, the turning movement of the U gage A, resulting from the displacement of the sealing liquidin the U tube, due to the differential between the pressures transmitted through the corresponding tubes C and C is a measure of the current flow through the conduit 6 creating that pressure differential.

Similarly variations in the flow through the conduit E will cause corresponding oscillations of the gage AA. \Vhen. as already explained. thegage AA lags behind or swings ahead of the gage A. the motor G is operated .as required to adjust the damper G, and thereby the flow through the conduit E, to maintain the predetermined ratio between that flow and flow through the conduit 0. The flow through the conduit e, and thereby the flow through the conduit E, since the two vary together, is recorded on the'record disk 0'.

In calibrating the apparatus shown the balance weight F of the gage A is adjusted to secure the esired range of movement of the marking element over the record disk, and by adjusting the balance weight F of the gage AA the ratio between the flows which will cause the'gages to turn in unison may be varied It will be readily apparent that each of ,aplura-lity of variable quantities may be kept in a predetermined ratio with one independently variable quantity Q arranged on opposite sides of a contact bar R carried by the gage a and parallel to j the common axis of oscillation of the different gages. GA, GB and G0 are, electrically operated regulators for the flows .to which the-gages aa, a?) andoo respectively respond. A source of current 8 energizes each of the regulators in one direction or the other when the movement of the corresponding gage aa, ab or (60 relative to the gage (4 causes the bar R to engage the corresponding contact Q, or Q. The gage a is provided with a marking element engaging the record disk 0.

While in accordance with the provisions of the statutes 1 have illustrated and described the best form of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed with-. out departing from the spirit of the invention set forth in the appended claims, and that certain features of my invention may sometimes be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A controlling instrument for ratio regulating apparatus comprising a pair of tilting U tube gages each adapted to be connected to a separate conduit and to be controlled in angular position by the flow through said conduit, and means carried by the two gages and operative through 7 changes in their relative angular positions 2. In combination with a pair of conduits, a pair of difierential pressure gages associated one'with one and the other with the other of said conduits, and each responsive to the rate of flow in its connected conduit irrespective of the rate of How in the other of said'conduits, a device for adjusting'the flow in one of said conduits, and controlling means. therefor including coacting parts carried by the two gages which cooperate to adjust said device as required to maintain a predetermined ratio of flow through the two conduits.

3. In combination with a pair of conduits, a pair of differential pressure gages of the pivoted U tube type, associated one with one, and the other with the second of said conduits, a device for adjusting the flow in one of said conduits and controlling means therefor including coacting parts carried by the two gages which cooperate to adjust said device as required to maintain a predetermined ratio of flow through the two'conduits.

4. An instrument for maintaining a predetermined ratio between two fluid rates of flow comprising in combination a pair of V differential pressure gages, one responsive .to one, and the other to the second of said rates of flow, electrical means for adjusting one of said rates of flow and circuit controll ng devices carried by the two gages and cooperating to control said adjusting means.

5. In combination with a pair of conduits, a pair of differential pressure gages of the pivoted U tube type, associated one with one,-a'nd the other with thesecond of said conduits, a device for adjusting the flow in one of said conduits and controlling means therefor including coacting parts carried by the two gages which cooperate to adjust said device as required to maintain a predetermined ratio of flow through the two conduits, and means for adjusting one of said gages to vary said ratio.

WILLIAM J. CROWELL, JR. 

